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Liquid crystal display device having look up table for adjusting common voltages and driving method thereof

a technology of liquid crystal display and look up table, which is applied in the direction of static indicating devices, instruments, etc., can solve the problems of poor display performance of lcd b>10/b> and poor electrical conductivity of common electrode material 111/b>

Active Publication Date: 2012-11-06
INNOLUX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively prevents image flickering and maintains stable display performance by continuously adjusting common voltages according to recorded optimal values, ensuring consistent operation over varying temperatures and usage times.

Problems solved by technology

On the other hand, an electrical conductivity of the material of the common electrode 111 is poor.
Therefore, the display performance of the LCD 10 is poor.

Method used

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  • Liquid crystal display device having look up table for adjusting common voltages and driving method thereof
  • Liquid crystal display device having look up table for adjusting common voltages and driving method thereof
  • Liquid crystal display device having look up table for adjusting common voltages and driving method thereof

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first embodiment

[0014]FIG. 1 is a block diagram of an LCD device according to the present disclosure. The LCD device 20 includes an LCD panel 201 and a driving circuit 202. The driving circuit 202 includes a common voltage generating circuit 210 and a data driving circuit 220. The common voltage generating circuit 210 provides common voltages to a common electrode of the LCD panel 201. The data driving circuit 220 provides gray level voltages to pixel electrodes of the LCD panel 201. A voltage difference formed between the common voltages and the gray level voltages generates electric fields to drive liquid crystal molecules of the LCD panel 201.

[0015]The common voltage generating circuit 210 includes a timer 211, a microprocessor 212, a look up table 213, a voltage adjustment circuit 214, and a buffer, labeled as an output terminal 215. The microprocessor 212 is electrically connected to the timer 211, the look up table 213, and the voltage adjustment circuit 214. The output terminal 215 is electr...

second embodiment

[0028]FIG. 3 shows a block diagram of an LCD device according to the present disclosure. The LCD device 30 is generally similar to the LCD device 20 except that the driving circuit 302 further includes a timing controller 330, and the timer 311 further includes a counter 316. The timing controller 330 provides clock signals to a data driving circuit 320 and a timer 311. The clock signal has a period Ta. An initial counter value X of the counter 316 is set to zero. At each time when a voltage level of the clock signal changes from a high level to a low level, the recording value X increases by one. When the recording value X reaches a predetermined value, for example, X=10000, the counter 316 sends the recording value X to a microprocessor 312. The microprocessor 312 calculates continuous operated time T of the LCD device 30, by the formula: T=X*Ta. Then the microprocessor 312 reads out an optimal common voltage corresponding to the continuous operated time T in a look up table 313. ...

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PUM

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Abstract

A liquid crystal display (LCD) device includes an LCD panel, and a common voltage generating circuit configured for providing common voltages to the LCD panel. The common voltage generating circuit includes a microprocessor, a timer, a voltage adjustment circuit, and a look up table. The microprocessor is electrically connected to the timer, the look up table, and the voltage adjustment circuit. The timer is configured for recording a continuous operated time of the LCD panel. The look up table is configured for storing optimal common voltages corresponding to each continuous operated time. The microprocessor is configured for reading the optimal common voltage at set intervals corresponding to the continuous operated time, and controlling the voltage adjustment circuit to provide the corresponding optimal common voltage to the LCD panel.

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to liquid crystal display devices (LCDs) and methods for driving the LCD devices, and particularly to an LCD device having a look up table for adjusting common voltages and a method for driving the same.[0003]2. Description of Related Art[0004]Because LCDs have the advantages of portability, low power consumption, and low radiation, they have been widely used in various portable information products such as notebooks, personal digital assistants (PDAs), video cameras, and the like.[0005]Referring to FIG. 4, a typical LCD 10 includes an LCD panel 11. The LCD panel 11 includes a pixel electrode 112, a common electrode 111, a liquid crystal layer 113, an upper polarizer 114, and a lower polarizer 115. The upper polarizer 114 is disposed opposite to the lower polarizer 115, and a polarizing axis of the upper polarizer 114 is perpendicular to that of the lower polarizer 115. The liquid crystal layer 113 is sandwiched ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G09G3/36
CPCG09G3/3655G09G2320/0247G09G2320/048
Inventor CHANG, CHIH-SHENGHUNG, CHAO-YICHEN, SZ-HSIAOCHO, SHENG-TIENCHEN, CHUEH-JUHSIEH, TSAU-HUAYANG, CHIU-LIEN
Owner INNOLUX CORP